I don't take toys in the bathtub or shower with me. I usually don't have time (big family, and someone always needs to use the bathroom) and often My Man will walk in to harass me, take a pee or even get in the tub with me. So, there's usually no need.
I prefer dildos in the shower/bath mostly because they're not going to get ruined by the water. However, if I have a good waterproof toy, I'll definitely take that in with me, but those are hard to come by.